Portable audio system



FIG. 1 is a left side perspective view of a portable audio system showing our new design;

FIG. 2 is a right side perspective thereof, with cassette and CD player doors in an open position and antenna in an upright position;

FIG. 3 is a top plan view of FIG. 1;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a left side elevational view thereof; and,

FIG. 8 is a right side elevational view thereof.

The surface(s) or portion(s) of the article not shown in the drawing or described in the specification form(s) no part of the claimed design. 

The ornamental design for a portable audio system, as shown and described. 